Diffuser and hair dryer

ABSTRACT

Disclosed is a diffuser and a hair dryer. The diffuser includes a casing, which includes: an air inlet end, configured to be in communication with a main body of the hair dryer; and an air outlet end, defining at least two first air outlet holes, where air outlet directions of the at least two first air outlet holes are configured to be distributed at intervals clockwise or counterclockwise around a center of the air outlet end. The technical solution of the present disclosure improves the hair blowing effect of the hair dryer.

CROSS-REFERENCE TO RELATED APPLICATIONS

The present application claims the benefits of and priority to Chinese Patent Application with No. 202020322808.2, filed on Mar. 13, 2020 and Chinese Patent Application with No. 202010180713.6, filed on Mar. 13, 2020, the entire disclosure of which are hereby incorporated by reference, in their entirety, for all that they teaches and for all purposes.

FIELD

The present disclosure relates to the technical field of hair dryers, in particular to a diffuser and a hair dryer applying the diffuser.

BACKGROUND

At present, the hair dryer on the market generally has a diffuser connected to one end of the main body, and the diffuser guides the air flow to make the hair dryer have a better blowing effect. However, the air flow from the diffuser of the hair dryer in the related art is linear. The linear air flow reduces the hair blowing effect of the hair dryer due to the small contact area with the hair.

The above content is only used to assist in understanding the technical solution of the present disclosure, and does not mean that the above content is prior art.

SUMMARY

The main object of the present disclosure is to provide a diffuser, which is applied to a hair dryer, and aims to improve the hair blowing effect of the hair dryer.

To achieve the above object, the diffuser provided by the present disclosure includes:

a casing, including:

-   -   an air inlet end, configured to be in communication with a main         body of the hair dryer; and     -   an air outlet end, defining at least two first air outlet holes,         where air outlet directions of the at least two first air outlet         holes are configured to be distributed at intervals clockwise or         counterclockwise around a center of the air outlet end.

In an embodiment of the present disclosure, the diffuser further includes:

at least two first protruding posts, provided on an air outlet end face of the air outlet end and configured to be in communication with the air outlet end, where one of the at least two first air outlet holes is configured to be defined on an outer peripheral surface of one of the at least two first protruding posts.

In an embodiment of the present disclosure, the one of the at least two first air outlet holes is configured to be arranged in a strip shape, and configured to extend from a side away from the air outlet end face of the corresponding one of the at least two first protruding posts to a side adjacent to the air outlet end face of the corresponding one of the at least two first protruding posts.

In an embodiment of the present disclosure, the diffuser defines a second air outlet hole on the side away from the air outlet end face of the one of the at least two first protruding posts, and an air outlet direction of the second air outlet hole is configured to be parallel to an extending direction of the corresponding one of the at least two first air outlet holes.

In an embodiment of the present disclosure, where:

the diffuser further includes:

-   -   a second protruding post, provided on the air outlet end face         and configured to be in communication with the air outlet end;         and

the diffuser further defines:

-   -   a third air outlet hole on an outer peripheral surface of the         second protruding post, and an air outlet direction of the third         air outlet hole is configured to be toward the center of the air         outlet end.

In an embodiment of the present disclosure, at least two of the second protruding posts are configured to be provided inside the at least two first protruding posts and evenly distributed at intervals surround the center of the air outlet end.

In an embodiment of the present disclosure, the third air outlet hole is configured to be arranged in a strip shape, and configured to extend from a side away from the air outlet end face of the second protruding post to a side adjacent to the air outlet end face of the second protruding post.

In an embodiment of the present disclosure, where:

a side of one of the at least two first protruding posts away from the air outlet end face and a lateral peripheral surface of the one of the at least two first protruding posts are configured to be arranged in a smooth transition, and a side away from the air outlet end face of the second protruding post and a lateral peripheral surface of the second protruding post are configured to be arranged in a smooth transition; and/or

the one of the at least two first protruding posts and the second protruding post are configured to be provided in an integrated structure with the air outlet end.

In an embodiment of the present disclosure, the diffuser further defines a fourth air outlet hole on the air outlet end face, and an air outlet direction of the fourth air outlet hole is configured to be parallel to an extending direction of a center line of one of the at least two first protruding posts.

In an embodiment of the present disclosure, the air outlet end face is configured to be provided in a concave arc shape to the main body.

The present disclosure further provides a hair dryer, including a diffuser as described in any one of the foregoing embodiments.

According to the technical solution of the present disclosure, when the diffuser is applied to the hair dryer, the air inlet end on the casing of the diffuser communicates with the main body, so that the air flow blown out by the main body enters the casing from the air inlet end and flows out from the air outlet end of the casing after the guidance of the diffuser. The diffuser defines at least two first air outlet holes at the air outlet end, and air outlet directions of the at least two first air outlet holes are distributed at intervals clockwise or counterclockwise around a center of the air outlet end, so that a vortex air flow may be formed after flowing out of at least two first air outlet holes. Compared with the linear air flow from the diffuser in the prior art, the contact area of the vortex air flow and the hair is increased, thereby improving the hair blowing effect of the hair dryer.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly explain the embodiments of the present disclosure or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely some embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can be obtained based on the structure shown in these drawings without paying creative work.

FIG. 1 is a schematic structural diagram of a hair dryer according to an embodiment of the present disclosure; and

FIG. 2 is a schematic structural diagram of a diffuser according to an embodiment of the present disclosure.

The realization of the object, functional characteristics and advantages of the present disclosure will be further explained with reference to the embodiments and the drawings.

DETAILED DESCRIPTION OF THE EMBODIMENTS

In the following, the technical solutions in the embodiments of the present disclosure will be clearly and completely described with reference to the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, but not all of the embodiments. Based on the embodiments of the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present disclosure.

It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of the present disclosure are only used to explain the relative positional relationship, movement situation, etc. between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indication also changes accordingly.

In the present disclosure, the terms “connected”, “fixed” and the like shall be understood in a broad sense unless otherwise specified and defined, for example, “connected” may be a fixed connection, a detachable connection, or be integrated into one; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, or it may be the internal connection of two elements or the interaction relationship between two elements, unless it is clearly defined otherwise. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure can be understood according to specific situations.

In addition, the descriptions related to “first”, “second”, and the like in the present disclosure are for descriptive purposes only, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as “first” and “second” may explicitly or implicitly include at least one of the features. In addition, the meaning of “and/or” appearing throughout the text is that it includes three side-by-side solutions, taking “A and/or B” as an example, it includes solution A, or solution B, or solution that A and B meet at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but must be based on those that can be realized by a person of ordinary skill in the art. When the combination of technical solutions conflicts or cannot be achieved, it should be considered that such a combination of technical solutions does not exist, nor within the protection scope claimed by the present disclosure.

With reference to FIGS. 1 and 2, the present disclosure provides a diffuser 100 applied to a hair dryer 1000.

In an embodiment of the present disclosure, the diffuser 100 includes a casing 10, which includes: an air inlet end 10 a, configured to be in communication with a main body 300 of the hair dryer 1000; and an air outlet end 10 b, defining at least two first air outlet holes 30 a, where air outlet directions of the at least two first air outlet holes 30 a are configured to be distributed at intervals clockwise or counterclockwise around a center of the air outlet end 10 b.

In an embodiment of the present disclosure, the casing 10 is mainly configured to form an air guide channel to guide the air flow blown out by the main body 300 to increase the contact area with the hair. Specifically, the casing 10 may be substantially in a shape of a circular table, and a cross-sectional area of the casing 10 is gradually increased from the air inlet end 10 a to the air outlet end 10 b. In this way, the air flow blown out from the main body 300 may flow in the extending direction of the inner wall of the casing 10 to the air outlet end 10 b to increase the air outlet range. The casing 10 is provided in the shape of a circular table, so that the air flows at the same speed all around the inner peripheral surface of the casing 10, so that the air flow blown out by the hair dryer 1000 is more uniform to further improve the blowing effect. In addition, in order to reduce the mass of the hair dryer 1000 to be convenient for a user to hold, the material of the casing 10 may be a plastic material, such as: ABS, POM, PS, PMMA, PC, PET, and the like. The air inlet end 10 a is mainly configured to communicate with the main body 300, and specifically, a through hole communicating with the main body 300 may be defined to realize communication between the two. The air inlet end 10 a and the main body 300 may be fixed by screws, buckles or magnetic suction, so that when the diffuser 100 or the main body 300 is damaged, they can be disassembled to perform maintenance and replacement, thereby avoiding maintenance and replacement of the whole when local damage happens, thus reducing the maintenance and replacement cost of the hair dryer 1000. The air outlet end 10 b is mainly configured for the outflow of the air flow in the casing 10, and specifically, the outflow of the air flow may be achieved through the first air outlet holes 30 a.

According to the technical solution of the present disclosure, when the diffuser 100 is applied to the hair dryer 1000, the air inlet end 10 a on the casing 10 of the diffuser 100 communicates with the main body 300, so that the air flow blown out by the main body 300 enters the casing 10 from the air inlet end 10 a and flows out from the air outlet end 10 b of the casing 10 after the guidance of the diffuser 100. The diffuser 100 defines at least two first air outlet holes 30 a at the air outlet end 10 b, and air outlet directions of the at least two first air outlet holes 30 a are distributed at intervals clockwise or counterclockwise around a center of the air outlet end 10 b, so that a vortex air flow may be formed after flowing out of at least two first air outlet holes 30 a. Compared with the linear air flow from the diffuser in the prior art, the contact area of the vortex air flow and the hair is increased, thereby improving the hair blowing effect of the hair dryer 1000.

Referring to FIG. 2, in an embodiment of the present disclosure, the diffuser 100 further includes: at least two first protruding posts 30, provided on an air outlet end face 10 c of the air outlet end 10 b and configured to be in communication with the air outlet end 10 b, where one of the at least two first air outlet holes 30 a is configured to be defined on an outer peripheral surface of one of the at least two first protruding posts 30.

It can be understood that, each first air outlet hole 30 a is defined on the outer peripheral surface of each corresponding first protruding post 30, and the orientations of the first air outlet holes 30 a are sequentially formed in a clockwise interval distribution or a counterclockwise interval distribution, so that it can be ensured that the air flow blown out by the diffuser 100 is formed into a vortex air flow under the action of the first air outlet holes 30 a, thereby reducing the complexity of forming the air guide channel in the diffuser 100 and improving the production efficiency of the diffuser 100. At the same time, when the user blows hair, the abutting effect of the first protruding posts 30 prevents the hair from sticking to the diffuser 100 when the distance between the diffuser 100 and the hair is too close. The setting of the air outlet end face 10 c enables the air flow blown out by the diffuser 100 to be more concentrated, so as to increase the speed of the air flow. In order to ensure the uniformity of the air flow blown out by the diffuser 100 in the axial direction, at least two first protruding posts 30 are evenly distributed at intervals around the center of the air outlet end 10 b. Certainly, the present disclosure is not limited to this. In other embodiments, at least two arc-shaped air guide channels may be formed inside the air outlet end 10 b, so that the air flow in the diffuser 100 forms a vortex air flow under the action of the arc-shaped air guide channels. Then, when flowing out from the first air outlet holes 30 a, a clockwise or counterclockwise air flow is formed.

In an embodiment of the present disclosure, the one of the at least two first air outlet holes 30 a is configured to be arranged in a strip shape, and configured to extend from a side away from the air outlet end face 10 c of the corresponding one of the at least two first protruding posts 30 to a side adjacent to the air outlet end face 10 c of the corresponding one of the at least two first protruding posts 30.

It can be understood that this setting increases the air outlet area of the first air outlet hole 30 a, so that the air volume of the diffuser 100 from the first air outlet hole 30 a may be increased, and the blowing effect of the diffuser 100 may be improved.

In an embodiment of the present disclosure, the diffuser 100 further defines a second air outlet hole 30 b on the side away from the air outlet end face 10 c of the one of the at least two first protruding posts 30, and an air outlet direction of the second air outlet hole 30 b is configured to be parallel to an extending direction of the corresponding one of the at least two first air outlet holes 30 a.

It can be understood that, by setting the second air outlet hole 30 b, not only a vortex air flow is formed at the first protruding posts 30 of the diffuser 100, but also a linear air flow parallel to the extending direction of the first air outlet hole 30 a is formed, namely, the air outlet direction of the second air outlet hole 30 b and the extending direction of the center line of the corresponding first protruding post 30 are arranged in parallel. In this way, the air outlet direction of the diffuser 100 is more diversified, so that the contact area between the air flow blown out by the diffuser 100 and the hair can be further increased to further improve the blowing effect of the diffuser 100. The first air outlet hole 30 a and the second air outlet hole 30 b may be independently defined to ensure the respective air output. Certainly, it is also possible that the first protruding post 30 is partially cut away from a lateral end face away from the air outlet end face 10 c to a side adjacent to the air outlet end face 10 c to form the first air outlet hole 30 a and the second air outlet hole 30 b which are in communication with each other, so that the first air outlet hole 30 a and the second air outlet hole 30 b may be formed at one time.

In an embodiment of the present disclosure, where: the diffuser 100 further includes: a second protruding post 50, provided on the air outlet end face 10 c and configured to be in communication with the air outlet end 10 b; and the diffuser 100 further defines: a third air outlet hole 50 a on an outer peripheral surface of the second protruding post 50, and an air outlet direction of the third air outlet hole 50 a is configured to be toward the center of the air outlet end 10 b.

It can be understood that, by setting the third air outlet hole 50 a, air flow may be blown toward the center of the air outlet end 10 b at the second protruding post 50 of the diffuser 100, thus further increasing the diversified air outlet direction of the diffuser 100, so that the blowing effect of the diffuser 100 may be further improved. At least two of the second protruding posts 50 may be provided inside the at least two first protruding posts 30, and evenly distributed at intervals surround the center of the air outlet end 10 b. In this way, the air volume from the diffuser 100 at the second protruding posts 50 and the uniformity of the air output are improved. Further, the third air outlet hole 50 a may penetrate the lateral peripheral surface of the second protruding post 50. Namely, after the air flow in the diffuser 100 passes through the second air outlet hole 30 b, part of the air flow may be blown toward the center of the air outlet end 10 b, and part of the air flow may be blown toward the periphery of the air outlet end 10 b, so as to further increase the diversification of the air outlet direction of the diffuser 100.

In an embodiment of the present disclosure, the third air outlet hole 50 a is configured to be arranged in a strip shape, and configured to extend from a side away from the air outlet end face 10 c of the corresponding second protruding post 50 to a side adjacent to the air outlet end face 10 c of the corresponding second protruding post 50.

It can be understood that, by this setting, the air outlet area of the second air outlet hole 30 b may be increased, so that the air volume of the diffuser 100 from the second air outlet hole 30 b may be increased, and the blowing effect of the diffuser 100 may be improved.

In an embodiment of the present disclosure, where: a side of one of the at least two first protruding posts 30 away from the air outlet end face 10 c and a lateral peripheral surface of the one of the at least two first protruding posts 30 are configured to be arranged in a smooth transition, and a side away from the air outlet end face 10 c of the second protruding post 50 and a lateral peripheral surface of the second protruding post 50 are configured to be arranged in a smooth transition.

It can be understood that the smooth transition setting prevents the first protruding post 30 and the second protruding post 50 from forming a corner on the side facing away from the air outlet end face 10 c, and prevents scratches caused to the scalp, thereby improving the safety of using the diffuser 100.

In one embodiment of the present disclosure, the first protruding post 30 and the second protruding post 50 are provided in an integrated structure with the air outlet end 10 b.

It can be understood that, by this setting, the connection strengths between the first protruding post 30 and the air outlet end 10 b and between the second protruding post 50 and the air outlet end 10 b may be increased, thereby improving the fixing stability of the first protruding post 30 and the second protruding post 50, and avoiding the first protruding post 30 and the second protruding post 50 from breaking off after being impacted, thereby avoiding reducing the useful life of the diffuser 100. At the same time, this setting avoids forming a gap at the connection between the first protruding post 30 and the air outlet end 10 b or between the second protruding post 50 and the air outlet end 10 b, thereby affecting the sealing performance In addition, the first protruding post 30 and the second protruding post 50 may respectively be provided with an air guide channel to communicate with the air outlet end 10 b.

In an embodiment of the present disclosure, the diffuser 100 further defines a fourth air outlet hole 10 d on the air outlet end face 10 c, and an air outlet direction of the fourth air outlet hole 10 d is configured to be parallel to an extending direction of a center line of one of the at least two first protruding posts 30.

It can be understood that by setting the fourth air outlet hole 10 d, a part of the air flow in the diffuser 100 may flow out from the fourth air outlet hole 10 d, thereby further increasing the air volume of the diffuser 100 and improving the blowing effect of the diffuser 100. The fourth air outlet hole 10 d may be defined in a gap between the first protruding post 30 and the second protruding post 50, so that the air flow between the first protruding post 30 and the second protruding post 50 may directly flow out from the fourth air outlet hole 10 d, other than colliding with the inner wall of the air outlet end 10 b and then flow out from the first air outlet hole 30 a and the second air outlet hole 30 b on both sides, thereby reducing the energy loss of the air flow and ensuring the blowing speed.

In an embodiment of the present disclosure, the air outlet end face 10 c is configured to be provided in a concave arc shape to the main body.

It can be understood that the arc-shaped air outlet end face 10 c has a converging effect on the air flow blown out by the diffuser 100, thereby ensuring that the area where the diffuser 100 is projected by the air outlet end 10 b has a large air flow, and improving the hair drying and shaping effects. Moreover, the air flow blown out by the diffuser 100 from the first air outlet hole 30 a may be easier to form a vortex air flow under the guidance of the arc-shaped wall surface, thereby increasing the contact area with the hair.

With reference to FIG. 1 and FIG. 2, the present disclosure further provides a hair dryer 1000, which includes a diffuser 100. The specific structure of the diffuser 100 may refer to the above embodiments. Since the hair dryer 1000 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects of the technical solutions of the above embodiments, which will not be described in detail here. An air inlet end 10 a of the diffuser 100 is connected to the main body 300, and the main body 300 includes a main body portion 310 and a handle portion 330. A heater is provided in the main body portion 310. One end of the handle portion 330 communicates with one end of the main body portion 310, and a motor is provided in the handle portion 330 to drive external air into the handle portion 330 and flow into the main body portion 310 for heating by the heater. The air inlet end 10 a of the diffuser 100 communicates with the end of the main body portion 310 away from the handle portion 330. The air flow in the main body portion 310 may flow into the diffuser 100 after passing through the heater, and then be guided by the diffuser 100 to increase the blowing area.

The above are only preferred embodiments of the present disclosure, and thus do not limit the scope of the present disclosure. Under the inventive concept of the present disclosure, equivalent structural transformations made using the description and drawings of the present disclosure, or directly/indirectly used in other related technical fields are all included in the patent protection scope of the present disclosure. 

What is claimed is:
 1. A diffuser applied to a hair dryer, comprising: a casing, comprising: an air inlet end, configured to be in communication with a main body of the hair dryer; and an air outlet end, defining at least two first air outlet holes, wherein air outlet directions of the at least two first air outlet holes are configured to be distributed at intervals clockwise or counterclockwise around a center of the air outlet end.
 2. The diffuser according to claim 1, further comprising: at least two first protruding posts, provided on an air outlet end face of the air outlet end and configured to be in communication with the air outlet end, wherein one of the at least two first air outlet holes is configured to be defined on an outer peripheral surface of one of the at least two first protruding posts.
 3. The diffuser according to claim 2, wherein the one of the at least two first air outlet holes is configured to be arranged in a strip shape, and configured to extend from a side away from the air outlet end face of the corresponding one of the at least two first protruding posts to a side adjacent to the air outlet end face of the corresponding one of the at least two first protruding posts.
 4. The diffuser according to claim 3, wherein the diffuser defines a second air outlet hole on the side away from the air outlet end face of the one of the at least two first protruding posts, and an air outlet direction of the second air outlet hole is configured to be parallel to an extending direction of the corresponding one of the at least two first air outlet holes.
 5. The diffuser according to claim 2, wherein: the diffuser further comprises: a second protruding post, provided on the air outlet end face and configured to be in communication with the air outlet end; and the diffuser further defines: a third air outlet hole on an outer peripheral surface of the second protruding post, and an air outlet direction of the third air outlet hole is configured to be toward the center of the air outlet end.
 6. The diffuser according to claim 5, wherein at least two of the second protruding posts are configured to be provided inside the at least two first protruding posts and evenly distributed at intervals surround the center of the air outlet end.
 7. The diffuser according to claim 5, wherein the third air outlet hole is configured to be arranged in a strip shape, and configured to extend from a side away from the air outlet end face of the second protruding post to a side adjacent to the air outlet end face of the second protruding post.
 8. The diffuser according to claim 5, wherein: a side of one of the at least two first protruding posts away from the air outlet end face and a lateral peripheral surface of the one of the at least two first protruding posts are configured to be arranged in a smooth transition; and a side away from the air outlet end face of the second protruding post and a lateral peripheral surface of the second protruding post are configured to be arranged in a smooth transition; and/or the one of the at least two first protruding posts and the second protruding post are configured to be provided in an integrated structure with the air outlet end.
 9. The diffuser according to claim 2, wherein the diffuser further defines a fourth air outlet hole on the air outlet end face, and an air outlet direction of the fourth air outlet hole is configured to be parallel to an extending direction of a center line of one of the at least two first protruding posts.
 10. The diffuser according to claim 9, wherein the air outlet end face is configured to be provided in a concave arc shape to the main body.
 11. A hair dryer, comprising a diffuser, wherein the diffuser comprises: a casing, comprising: an air inlet end, configured to be in communication with a main body of the hair dryer; and an air outlet end, defining at least two first air outlet holes, wherein air outlet directions of the at least two first air outlet holes are configured to be distributed at intervals clockwise or counterclockwise around a center of the air outlet end.
 12. The hair dryer according to claim 11, wherein the diffuser further comprises: at least two first protruding posts, provided on an air outlet end face of the air outlet end and configured to be in communication with the air outlet end, wherein one of the at least two first air outlet holes is configured to be defined on an outer peripheral surface of one of the at least two first protruding posts.
 13. The hair dryer according to claim 12, wherein the one of the at least two first air outlet holes is configured to be arranged in a strip shape, and configured to extend from a side away from the air outlet end face of the corresponding one of the at least two first protruding posts to a side adjacent to the air outlet end face of the corresponding one of the at least two first protruding posts.
 14. The hair dryer according to claim 13, wherein the diffuser defines a second air outlet hole on the side away from the air outlet end face of the one of the at least two first protruding posts, and an air outlet direction of the second air outlet hole is configured to be parallel to an extending direction of the corresponding one of the at least two first air outlet holes.
 15. The hair dryer according to claim 12, wherein: the diffuser further comprises: a second protruding post, provided on the air outlet end face and configured to be in communication with the air outlet end; and the diffuser further defines: a third air outlet hole on an outer peripheral surface of the second protruding post, and an air outlet direction of the third air outlet hole is configured to be toward the center of the air outlet end.
 16. The hair dryer according to claim 15, wherein at least two of the second protruding posts are configured to be provided inside the at least two first protruding posts and evenly distributed at intervals surround the center of the air outlet end.
 17. The hair dryer according to claim 15, wherein the third air outlet hole is configured to be arranged in a strip shape, and configured to extend from a side away from the air outlet end face of the second protruding post to a side adjacent to the air outlet end face of the second protruding post.
 18. The hair dryer according to claim 15, wherein: a side of one of the at least two first protruding posts away from the air outlet end face and a lateral peripheral surface of the one of the at least two first protruding posts are configured to be arranged in a smooth transition; and a side away from the air outlet end face of the second protruding post and a lateral peripheral surface of the second protruding post are configured to be arranged in a smooth transition.
 19. The hair dryer according to claim 12, wherein the diffuser further defines a fourth air outlet hole on the air outlet end face, and an air outlet direction of the fourth air outlet hole is configured to be parallel to an extending direction of a center line of one of the at least two first protruding posts.
 20. The diffuser according to claim 19, wherein the air outlet end face is configured to be provided in a concave arc shape to the main body. 